I know this isn’t a new product, but I’ve recently re-discovered it. Wonder Tape is a 1/4″-wide, double-sided, transparent tape that can be stitched through without gumming up the needle of your sewing machine. And the best part is… it completely disappears when you wash your project — the first time!
My favorite place to use it is when stitching zippers. Just remove the paper backing and use the tape to hold the zipper just where you want it on the fabric. If you haven’t used it before, you’ll wonder why, once you try it. (I wonder if that’s where the name comes from?)